Why Your curl Test Passes But Your AI Coding Assistant Still Fails

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Developers using AI coding tools like Cline or Continue often encounter errors even after a successful curl smoke test returns HTTP 200, which can be misleading. The root cause is typically a mismatch between the protocol or API path verified manually and the one the IDE client actually uses. Multi-protocol API gateways expose several surfaces — such as OpenAI Chat Completions, Responses, and Anthropic Messages — each with different authentication headers and URL paths. A curl test only confirms that one specific path and model ID are reachable for that account, not that the IDE is configured to use the same dialect. Developers are advised to match the client's expected protocol and base URL precisely before assuming a gateway or extension is at fault.

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